Improved lining- for moulds for casting metals



tinitml sale -eteae JOHN. FARRAR, OF PROVIDENCE, RHODE ISLAND, AND LEWISF WHITING, 'OF BOSTON, MASSACHUSETTS.

Letters Patent No. 86,145, dated Janua/ry 26, 1869.

IMPROVED LIN'ING- FOR MOU'LDS FOR CASTING METALS.

The Schedule referred to in these Letters Patent'and making part of thesame.

To all whom it may concern:

Be it known that we, JOHN FARRA R, of the city and county of Providence,and State of Rhode Island, and Lnwrs l WHITING, of Boston, in the countyof Suffolk, and State of Massachusetts, have invented anew and usefulImprovement in Lining for Moulds for Cast ing Metals; and we herebydeclare the following to be a full and correct description of the same,suificient to enable others skilled in the art to which our inventionappertains, to fully understand and apply the same.

The nature of our invention consists in an improvement on a lining formoulds for casting metals,described in the. patent granted to JohnFarrar and William Groves, July 30, 1867. Ellis last-mentioned lining,as has been proven by experience, is not capable of withstanding theheat. It cracks up, and ad heres to the casting, requiring repairs ofthe moulds.

Our improved lining is composed as follows:

Two parts plumbago two parts fire clay; one part ganister, or fire-sand;one part hard coke, pulverized, and passed .through a No. 8 sieve; mixedto paste with water, pressed into the flask, and then baked.

The proportions of these ingredients vary according to the thickness ofthe castings to be made.

By making merely one lining, we are enabled to make it thicker, andconsequently stronger; for the lining of Farrar and Groves, consistingof two comparatively thin layers, cracks easily, and is not dura ble,each lining being independent of the other, and ,the inner liningget-ting hot quicker than the outer.

Having thus described our invention,

What we claim as new, and desire to secure'by Letters Patent, is

The lining for moulds for casting metals, when composed of theingredients and in the proportions, substantially as herein described.

In testimony whereof, we have signed our names to this specification, inthe presence of two subscribing witnesses.

JOHN FABRAR. LEWIS F. WHITING. Witnesses:

CARROLL D. WRIGHT, M. S. G. WILDE.

